Hot-air furnace



5. SheetsSheet 1.

G. S. G. SPENCE.

' Hot Air Furnace.

No; 9,204. Patented Aug. 17, 1852.

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5 Sheets-Sheet 2. GI SI GI Hot Air Furnace.

No. 9,204. Patented Aug. 17, 1852.

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Hot Air Furnace.

No. 9,204. Patented Aug. 17, 1852.

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' 5 SheetS-Sheet '4. G. S. G. SPENCE.

Hot Air Furnace.

Patented Aug. 17, 1852.

, 5 Sheets-8heet 5. -G. S. G. SPENCE.

Hot Air Fu rnace.

Patented Aug. 17; 1852.

UNITED STATES PATENT OFFICE.

GEO. S. G. SPENGE, OF BOSTON, MASSACHUSETTS.

HOT-AIR FURNACE.

Specification of Letters Patent No. 9,204, dated August 17, 1852.

To all whom it may concern:

Be it known that I, GEORGE S. G. SPENcE, of Boston, in thecounty of Suffolk and State of Massachusetts, have invented a new and useful or Improved Hot-Air Furnace for Heating Air for Dissemination in the Rooms of a Building; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

Of the said drawings, Figure 1 denotes a front view of my improved hot air furnace. Fig. 2 is a vertical and longitudinal section of it taken through the damper of the smoke discharge flue. Fig. 3 is a horizontal section of the same taken through the fuel passage or the fire place door. Fig. 4 is a horizontal section taken through the ash pit. Fig. 5 is a vertical and longitudinal section taken through the left arched pipe and base chambers. Fig. 6 is a vertical and trans verse section taken through the front arched pipe. Fig. 7 is a vertical and longitudinal section taken through the right arched pipe. Fig. 8 is a transverse section taken through the back flues.

In the said drawings, A represents the chamber of combustion, having a grate B at its bottom and an ash pit C, below it. It is made of iron and placed within an air chamber D which is built of brick work or other proper material and inclosed within another chamber E. The air to be heated passes into the chamber E at F, and after circulating over the top and down through the space G that is between the chambers D, and E, it enters the air chamber where it comes in contact with the heat radiating surfaces, and is heated and finally suffered to escape through discharge pipes F, F, &c., leading to the different apartments.

In rear of the chamber of combustion and directly down in contact with its external surface I carry a descending flue A which I make to communicate at or near its upper end with the said chamber. At the bottom of the flue A such flue is made to open into a horizontal flue or chamber B, made in the base on which the fire place rests. Out of the top of the chamber B I open and carry upward, arch, or curve over, and make descend downward, what I term an ascending and descending flue or pipe C, such pipe at the bottom of its descending arm being made to open into another horizontal chamber D, that is made in the base and separated from the chamber B by means of a vertical partition a. Another ascending and descending flue or pipe F is made to open out of the top of the chamber D, to rise upward and arch over in front of the fire chamber, and descend and open into another horizontal flue or chamber L situated in the base as seen in the drawings. Out of the rear part of the chamber L an ascending and descending arched pipe G passes and is made to enter or open into another horizontal chamber H, which is separated from the chamber L by a vertical partition I). A vertical flue I opens out of the chamber H, ascends upward in contact with the back of the fire place and the flue A, and finally leads into the chimney. There is a communication or opening 0 between the upper part of the chamber of combustion and the pipe I, which opening is supplied with a damper or flue valve K, that can be turned by means of a rod L.

In the front of each of the chambers D and L as also through each of the partitions (1,, Z), an opening d, e, is made, to which opening covers or doors f, g, are applied, the said doors of each two openings d, e, being connected together by means of one or more rods 72., so that the removal of the front door may be made to effect that of the rear one. The openings of such doors are for the purpose of enabling a person to readily clean out the flues of the radiator.

In radiators as usually constructed much difliculty is often experienced from their pipes and flues becoming foul or obstructed by ashes, dirt, or cinders, collecting in them. The flues not only become choked by such, but their powers of absorbing and radiating heat become greatly diminished in consequence of the same. The chambers B, D, L, H, are not only to convey smoke but are for the collection of ashes or cinders that would be likely to lodge in the pipes, which ashes may be removed through the openings of such chambers. The employment of arched ascending and descending pipes in connection with such chambers, and arranged with respect to each other and the fire chamber as described, not only enables me to use the simple arched pipes to great advantage by the way of radiation of heat, but as preventives of obstructions from ashes.

The arrangement of arched pipes around the fire chamber, instead of placing a radiator over it as is customary, enables me to attain the very import-ant advantage of having a low hot air furnace, one that can be used in the very lowest cellars without rendering it necessary to resort to such expensive means as are generally adopted to set up ordinary furnaces in low cellars. I have so made my furnace that its joints from which gas might escape are mostly if not all, in such situations as to be readily ac cessible for the purpose of stopping them.

The arched fiues will not retain soot or ashes to any injurious extent, all of the same which would be likely to be deposited in them will fall through them and into the ash boxes or chambers beneath them.

Now I do not claim a descending draft as such, or an alternately descending and ascending draft, nor do I claim a draft divided and carried in different directions through several pipes or columns at a time, nor do I claim one undivided draft carried through several pipes or columns at a time, but

descending arched pipe C, the ash flue chamber D, the ascending and descending arched fine or pipe F the ash flue chamber L, the ascending and descending arched pipe G, the ash fiue chamber H and the vertical flue discharge pipe I, carried up against the back of the fire place, and having a communication with the fire place and a-damper all substantially as specified.

In testimony whereof I have hereto set my signature, this seventh day of April A. D. 1852.

GEO. S. G. SPENCE. Witnesses:

R. H. EDDY,

G. W. CUTLER. 

